Young cats purr in a monotone, while older ones do so in two to three resonant notes.
小猫发出的呼噜声是单音节的，长大后，猫咪能发出两到三种不同音调的呼噜声。
Although some big cats like lions exhibit a purr-like sound, studies show that the Patherinae subfamily: lion, tiger, leopard, jaguar, snow leopard, and clouded leopard do not exhibit true purring.
尽管像狮子一类的大型猫科动物也会发出呼噜般的声音，研究却表明豹亚科动物，比如狮子、老虎、美洲豹、美洲虎、雪豹及云豹，并不能发出真正的呼噜声。
While people usually think of cat purring as a sign of happiness, some cats make this purr-cry sound when they want to be fed.
一些猫儿发出这种混合着哭声的得意叫声是为了获得喂食，然而人们通常会认为它们这么做是为了表达快乐。
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